linux-kernel - [PATCH] arm64: dts: ti: k3-am642-hummingboard-t: correct rs485 rts polarity

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Date: Sat, 04 May 2024 13:35:54 +0200
From: Josua Mayer <josua@...id-run.com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, 
 Tero Kristo <kristo@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Josua Mayer <josua@...id-run.com>
Subject: [PATCH] arm64: dts: ti: k3-am642-hummingboard-t: correct rs485 rts
 polarity

The RS485 transceiver RE (Receiver enable) and DE (Driver enable) are
shorted and connected to both RTS/CTS of the SoC UART.
RE is active-low, DE is active-high.

Remove the "rs485-rts-active-low" flag to match RTS polarity with DE,
and fix communication in both transmit and receive directions.

Fixes: d60483faf914 ("arm64: dts: add description for solidrun am642 som and evaluation board")
Signed-off-by: Josua Mayer <josua@...id-run.com>
---
 arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts b/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts
index 234d76e4e944..5b5e9eeec5ac 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts
@@ -282,7 +282,6 @@ &main_uart3 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_uart3_default_pins>;
 	uart-has-rtscts;
-	rs485-rts-active-low;
 	linux,rs485-enabled-at-boot-time;
 	status = "okay";
 };

---
base-commit: 4cece764965020c22cff7665b18a012006359095
change-id: 20240504-ti-rs485-rts-e08a68eac841

Sincerely,
-- 
Josua Mayer <josua@...id-run.com>